R4R: get rid of double negatives: IsNotNegative -> IsAnyNegative

PENDING.md

@@ -30,6 +30,7 @@ BREAKING CHANGES
   * [\#3514](https://github.com/cosmos/cosmos-sdk/pull/3514) Various clean ups:
     - Replace all GetKeyBase* functions family in favor of NewKeyBaseFromDir and NewKeyBaseFromHomeFlag.
     - Remove Get prefix from all TxBuilder's getters.
+  * [\#3522](https://github.com/cosmos/cosmos-sdk/pull/3522) Get rid of double negatives: Coins.IsNotNegative() -> Coins.IsAnyNegative().
 
 * Tendermint
 

docs/_attic/sdk/core/examples/app1.go

@@ -154,7 +154,7 @@ func handleFrom(store sdk.KVStore, from sdk.AccAddress, amt sdk.Coins) sdk.Resul
 	senderCoins := acc.Coins.Minus(amt)
 
 	// If any coin has negative amount, return insufficient coins error.
-	if !senderCoins.IsNotNegative() {
+	if senderCoins.IsAnyNegative() {
 		return sdk.ErrInsufficientCoins("Insufficient coins in account").Result()
 	}
 

tests/test_cover.sh

@@ -5,7 +5,7 @@ PKGS=$(go list ./... | grep -v /vendor/ | grep -v github.com/cosmos/cosmos-sdk/c
 
 set -e
 echo "mode: atomic" > coverage.txt
-for pkg in ${PKGS[@]}; do
+for pkg in ${PKGS}; do
     go test -v -timeout 30m -race -coverprofile=profile.out -covermode=atomic "$pkg"
     if [ -f profile.out ]; then
         tail -n +2 profile.out >> coverage.txt;

types/coin.go

@@ -262,7 +262,7 @@ func (coins Coins) Minus(coinsB Coins) Coins {
 // negative coin amount was returned.
 func (coins Coins) SafeMinus(coinsB Coins) (Coins, bool) {
 	diff := coins.safePlus(coinsB.negative())
-	return diff, !diff.IsNotNegative()
+	return diff, diff.IsAnyNegative()
 }
 
 // IsAllGT returns true if for every denom in coins, the denom is present at a
@@ -284,7 +284,7 @@ func (coins Coins) IsAllGTE(coinsB Coins) bool {
 		return true
 	}
 
-	return diff.IsNotNegative()
+	return !diff.IsAnyNegative()
 }
 
 // IsAllLT returns True iff for every denom in coins, the denom is present at
@@ -380,22 +380,22 @@ func (coins Coins) IsPositive() bool {
 	return true
 }
 
-// IsNotNegative returns true if there is no coin amount with a negative value
-// (even no coins is true here).
-//
+// IsAnyNegative returns true if there is at least one coin whose amount
+// is negative; returns false otherwise. It returns false if the coin set
+// is empty too.
 // TODO: Remove once unsigned integers are used.
-func (coins Coins) IsNotNegative() bool {
+func (coins Coins) IsAnyNegative() bool {
 	if len(coins) == 0 {
-		return true
+		return false
 	}
 
 	for _, coin := range coins {
 		if coin.IsNegative() {
-			return false
+			return true
 		}
 	}
 
-	return true
+	return false
 }
 
 // negative returns a set of coins with all amount negative.

x/auth/stdtx.go

@@ -46,7 +46,7 @@ func (tx StdTx) ValidateBasic() sdk.Error {
 	if tx.Fee.Gas > maxGasWanted {
 		return sdk.ErrGasOverflow(fmt.Sprintf("invalid gas supplied; %d > %d", tx.Fee.Gas, maxGasWanted))
 	}
-	if !tx.Fee.Amount.IsNotNegative() {
+	if tx.Fee.Amount.IsAnyNegative() {
 		return sdk.ErrInsufficientFee(fmt.Sprintf("invalid fee %s amount provided", tx.Fee.Amount))
 	}
 	if len(stdSigs) == 0 {

x/bank/keeper.go

@@ -258,7 +258,7 @@ func addCoins(ctx sdk.Context, am auth.AccountKeeper, addr sdk.AccAddress, amt s
 	oldCoins := getCoins(ctx, am, addr)
 	newCoins := oldCoins.Plus(amt)
 
-	if !newCoins.IsNotNegative() {
+	if newCoins.IsAnyNegative() {
 		return amt, nil, sdk.ErrInsufficientCoins(fmt.Sprintf("%s < %s", oldCoins, amt))
 	}
 

x/bank/simulation/invariants.go

@@ -16,7 +16,7 @@ func NonnegativeBalanceInvariant(mapper auth.AccountKeeper) simulation.Invariant
 		accts := mock.GetAllAccounts(mapper, ctx)
 		for _, acc := range accts {
 			coins := acc.GetCoins()
-			if !coins.IsNotNegative() {
+			if coins.IsAnyNegative() {
 				return fmt.Errorf("%s has a negative denomination of %s",
 					acc.GetAddress().String(),
 					coins.String())

x/gov/msgs.go

@@ -65,7 +65,7 @@ func (msg MsgSubmitProposal) ValidateBasic() sdk.Error {
 	if !msg.InitialDeposit.IsValid() {
 		return sdk.ErrInvalidCoins(msg.InitialDeposit.String())
 	}
-	if !msg.InitialDeposit.IsNotNegative() {
+	if msg.InitialDeposit.IsAnyNegative() {
 		return sdk.ErrInvalidCoins(msg.InitialDeposit.String())
 	}
 	return nil
@@ -120,7 +120,7 @@ func (msg MsgDeposit) ValidateBasic() sdk.Error {
 	if !msg.Amount.IsValid() {
 		return sdk.ErrInvalidCoins(msg.Amount.String())
 	}
-	if !msg.Amount.IsNotNegative() {
+	if msg.Amount.IsAnyNegative() {
 		return sdk.ErrInvalidCoins(msg.Amount.String())
 	}
 	if msg.ProposalID < 0 {